Glencore Xstrata has sold its interest in the Las Bambas copper mine in Peru to a Chinese consortium in a $6 billion cash deal, making it one of China's largest mining acquisitions in recent years.

The commodities trader said on Sunday it had sold its interest to a consortium led by Hong Kong-listed MMG Ltd , the offshore arm of China Minmetals Corp.

Hong Kong-based Guoxin International Investment Corp Ltd and China's Citic Metal Co Ltd are the other partners in the consortium.

Minmetals had been reported to be the preferred bidder for the Peruvian copper mine.

Glencore agreed to sell Las Bambas to secure approval from China's competition authorities for its takeover of Anglo-Swiss miner Xstrata as Beijing feared the merged group would have too much power over the copper market.

A Chinese buyer had been considered a virtual certainty since Las Bambas was put on the block, given the deep pockets of China's state-owned enterprises and China's hunger for copper - it is already the world's top consumer of the metal.

Las Bambas, one of the largest mines in Xstrata's project portfolio, is due to begin production in 2015.It is expected to produce more than 450,000 tonnes of copper a year in its first five years and 300,000 tonnes a year thereafter.

Glencore will receive about $5.85 billion in cash upon completion of the deal. In addition, all capital expenditure and development costs since the beginning of the year until the closure of the deal will also be payable by the consortium.

Capital expenditure and other costs incurred since the start of the year were about $400 million as of March 31.

Glencore said proceeds from the sale will "immediately and materially" deleverage its balance sheet.

The deal, which is expected to close prior to the end of the third quarter, is subject to approval from China's Ministry of Commerce (MOFCOM) as well as approval from MMG's shareholders.

China Minmetals Non-Ferrous Metals Co Ltd, which holds about 74 percent of MMG, has agreed to vote in favour of the deal, Glencore said.

Glencore said it would continue to look for opportunities to reinvest capital and any surplus capital would be returned to shareholders.